US3468816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying an impure quaternary ammonium salt by addition of an epoxide
Assignee: ChampionX LLC
•
Filing: 1964-07-24
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Granted: 1969-09-23
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Expires: 1984-07-24
Abstract
No abstract record available.
Inventors
- 👤 William H Thompson
- 👤 Edward G Ballweber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/12; C07D233/14; C07D233/20; C07D233/26; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/19; C09; C09K; C09K3/00; C09K3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2127476A
Cited
US2676166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |